CVE-2026-74605
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
22/08/2026
Last modified:
22/08/2026
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
eventfs: Use children field for rcu head and add memory barriers<br />
<br />
When an eventfs inode is freed, it sets ei->is_freed and then uses its<br />
ei->list to add it to the srcu link list as the list field is a union with<br />
the rcu list head. As the ei->list is used to iterate over an SRCU<br />
protected list without taking the eventfs_mutex, there&#39;s nothing stopping<br />
the iteration over that list to see the ei->rcu instead of the ei->list<br />
and it will read a corrupt target.<br />
<br />
To fix this, change the union of the rcu list head with the children list.<br />
On freeing the eventfs inode, set the is_free and execute a smp_wmb()<br />
before adding the eventfs inode to the SRCU list.<br />
<br />
On iteration of the ei->children list, at the start, execute a smp_rmb()<br />
and then read the is_freed of the ei to see if the children list is still<br />
valid. If is_freed is set, then the ei_child read is not valid and the<br />
loop should exit immediately.